A reader alerts me that it might have been a hacker's work. It's not listed on his blog's full posts. I'm checking into it. In the meantime, I've taken it down. I'll keep you posted, as it were.
[Update: it was a hoax inserted into his blog by a hacker. Michael just emailed to confirm:
"I'm pretty sure I haven't commented on the firing of the U.S. attorneys. I really haven't looked into it enough to be able to comment knowledgeably."
I apologize. I was duped by a hacker. And it was a very good hacker. I've alerted US News' site as well.]